ET WEB_SPECIFIC_APPS TP-Link Wan6to4TunnelCfgRpm.htm dnsserver1 Parameter Buffer Overflow Attempt (CVE-2026-9105)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS TP-Link Wan6to4TunnelCfgRpm.htm dnsserver1 Parameter Buffer Overflow Attempt (CVE-2026-9105)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/userRpm/Wan6to4TunnelCfgRpm.htm"; fast_pattern;
    http.request_body;
    content:"dnsserver";
    pcre:"/^\d\x3d[^&]{27,}(?:&|$)/R";
    reference:url,lavender-bicycle-a5a.notion.site/TP-Link-TL-WR841ND-Wan6to4TunnelCfgRpm-24d53a41781f80c59ea7dd85fe2c2142;
    reference:cve,2026-9105;
    classtype:attempted-admin;
    sid:2071392; rev:2;
    metadata:affected_product TP_LINK, attack_target Networking_Equipment, tls_state plaintext, created_at 2026_08_05, cve CVE_2026_9105, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2026_08_05, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)